D.C.
My daughter was born in 11/01/05 too! They're birthday buddies. That being said she started to walk at 13 months. Before she walked on her own she spent alot of time hanginging on the couch. She also had trouble walking with us when we tried. Have you tried walking holding both of his hands? That helped a little with her.
I wouldn't suggest the walker becuase it actully weakens the upper leg muscles needed for walking. Lots of people suggest them but really they're useless expessially becuase your baby has already started on his own. Also if he's going to fall, you should let him fall becuase learning to land and picking himself back up are important to his development too.
I wouldn't worry about it too much. It sounds like he's on his way and just needs the confidence to do it on his own.